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Q .   If   N ,   the   set   of   all   natural   numbers ,   is   considered   as   the   universal   set ,   then   what   is   the   complement   of   the   set   { x :   x   ( a ,   b ]   where   x ,   a ,   and   b   N }   ? A .   1 ,   2 ,   3 , . . . . . . ,   a     b ,   b + 1 ,   . . . . . . B .   1 ,   2 ,   3 ,   . . . . . . . ,   a - 1     b ,   b + 1 ,   . . . . . . C .   1 ,   2 ,   3 ,   . . . . . . . ,   a     b + 1 ,   b + 2 ,   . . . . . . D .   1 ,   2 ,   3 ,   . . . . . ,   a - 1     b + 1 ,   b + 2 ,   . . . . . . .

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